Spectrographic and chemical analyses of whole-rock and insoluble-residue samples, Rolla 1° x 2° quadrangle, Missouri: Drill hole No. 4

Geochemical studies of the Rolla, Mo., 1° x 2° quadrangle were begun in 1977 as a part of a joint multidisciplinary study of the quadrangle by the U.S. Geological Survey and the Division of Geology and Land Survey, Missouri Department of Natural Resources. The study is to assess the mineral resource potential of the area by integrated geologic, geochemical, and geophysical studies.